Closure



ET AL June 9, 1936. w. w. EAGER CLOSURE Filed July 5, 1952 5Sheets-Sheet 1 .ZHVVENTUEE WMEBEEE ETTUENEY June 9, 1936. w. w. EAGER ETAL 2,043,472

CLOSURE Filed July 5, 1932 5 Sheets-Sheet 2 JNVENTUES 2 June 9, 1936. w.w. EAGER ET. AL

CLOSURE Filed July 5, 1932 3 Sheets-Sheet 3 .JNVENTUES M NEBEEE I. 521".Z'EENEY ETIUENEY Patented June 9, 1936 CLOSURE Wesley W. Eager andColumbus A. Tierney,

Los Angeles, Calif.

Application July 1932, Serial No. 620,884 5 Claims. (Cl. 20- 16) Thisinvention relates to closures and operating making it possible to employa closure which devices therefor, and has for an object the prowouldotherwise be of excessive length, inasmuch vision of a closure and anoperating and supportas it would be subjected to too severe bending ingdevice therefor of novel and highly efficient stresses on account of thedistance between its 5 design, which is particularly well adapted forpoints of support. 5. though notnecessarily limited to use in conjunc Afurther object in this connection is to protion with closures forrelativelylarge openings, vide a novel design of closur havingreinforcing such as the doorway of a garage, market, or the means forpreventing the closure from flexing like. i 7 either by sagging at thoseportions of the closure 10 A more detailed object is to provide a noveltype which are between the points oisupport thereof, 10 of mechanism forso supporting a closure that it or by twisting as a result of theapplication oi? can be moved optionally to open or closed positorsionalstresses thereto as in opening or closing tion byswinging it about anaxis extending lonthe door. gitudinally of the closure, the entireweight of Another object is to provide a closure and sup the closurebeing carried at all times solely by porting and operating meanstherefor, having 15 the supporting mechanism. r the characteristicsabove set forth, which is oi? A more detailed object is to provide aclosure simple and rugged design, capable of highly efiisupporting andoperating device of the general .cient and facile operation, and in thedesign of character indicated whereby the closure may be whichparticular attention has been paid to posiheld releasably in either openor closed position tiveness of operation in respect to moving the 20 andwhich is also adapted to move the closure to closure to either its openor its closed position open position by raising it bodily to an overheadand also in respect to the retention of the closure position so as toleave the entire doorway unobin selected position. i

struoted for passage therethrough and/or ob- The invention possessesother objects and valservation of or access to articles which areenuable features, some of which, with the foregoing, 25 closed by theclosure when in closed position. wil be set forth in the followingdescription of It is a further object of the present invention thepreferred form of our invention. lit is to be to so arrange thesupporting and operating deunderstood that we do not limit ourselves tothe vice that when the closure is in open position, it specificdisclosure made by the said description, is disposed horizontally andextendsthrough the as we may adopt variations of the preferred form 30uppermost portion of the doorway with aportlon within the scope of ourinvention, as set forth of the closure extending outwards therefrom soin the claims. ast'o dispense with the necessity of an awning Referringto the drawings: to protect goods displayedinside the doorway Figure 1is a perspective view illustrating a from the direct rays of the sun. ibuilding provided with a closure incorporating 35 Another object of ourinventionls to provide an the principles of the present invention.efficll'it operating mechanism for the closure Figure 2 is a transverse,vertical sectional view whereby it may be moved easily to open and towhich may be considered to have been tairen upon closed positions,fromaconvenient location which the line 2-2 of Figure l with thedirection of 40 may be remote from the closure when desired. view asindicated by the arrows. 40 A further object is to provide the operatingFigure 3 is a detail view in horizontal section mechanism with asuitable lock whereby maniputaken upon the line 3--i of Figure 2, withthe lation of the operating mechanism by anyone direction or view asindicated by the arrows. other than authorized'persons is prevented.Figure 4 is a transverse vertical sectional view A still further objectis to provide a novel desimilar to Figure 2, but showing a slightlymodivice for counterbalancing the weight of the 010- fied form ofcounterbalancing mechanism. In sure whereby the movement oi. the closurein this figure the closure is'shown in its closed posieither directionis greatly facilitated and which is tion.

adapted to holdthe closure stationary in any po- Figure 5 is a viewsimilar to Figure 4, but sition between its two' extremes of movementshowing the closure in its open position. 50 without its having to befastened. "Figure 6 is a horizontal sectional view, the

A further object of the present invention is to plane of section beingtaken upon the line 6--6 provide means for supporting the closurethrough-. of Figure 4 with the direction of view as indiout its entirerange of movement and at least cated. Portions of the figure are brokenaway one point intermediatethe ends thereof, thereby toreduce its size.

Figure '7 is a view in elevation showing the inside face of the closureitself and showing the novel type of reinforcing used in theconstruction thereof.

Figure 3 is a detail view in transverse vertical section takensubstantially upon the line 8-8 of Figure 7 with the direction of viewas indicated.

Figure 9 is a detail view in transverse vertical section, the plane ofsection being taken adjacent the center supporting bracket for theclosure. This plane may be assumed to have been taken upon the line 9-9of Figure 7 with the direction of view as indicated but with the closureswung to horizontal position.

In terms of broad inclusion, the device of the present inventioncomprises means for supporting a closure such as a garage or store doorof relatively large proportions, optionally in closed relationship to anopening or doorway, or in open position wherein the closure is elevatedand lies in a plane substantially perpendicular to its closed positionand closely adjacent the periphcry of the opening, thereby leavingsubstantially the entire opening unobstructed. The closure itself isprovided with reinforcing means resisting the flexing stresses to whichit may be subjected, and the supporting means for the closure are ofsuch design that as many additional supports may be providedintermediate the ends thereof as may be desired or necessary to meet therequirements of any particular installation, which feature also goes tothe suiiiciency of the invention in making it possible successfully andpractically to employ doors and other closures of relatively greatlength. Means are provided for moving the closure to and from closedposition;

and a novel design of counterbalancing mechanism is provided, wherebymovement of the closure in either direction is greatly facilitated. Thiscounterbalancing mechanism also is of novel design and is adapted toretain the closure in any position, i. e. at either of its two extremesof movement or in any intermediate position,

without its having to be fastened. The operating device is of theself-locking type; that is to say, after the closure has been moved toeither fully opened or closed position by means of the opcrating device,the closure cannot be removed from this position by any means other thanthe operating device itself. Moreover, the operating device may beprovided with a suitable lock, making it impossible for access to be hadto the enclosed space controlled by the closure, by anyone other thanauthorized persons.

Specifically describing one of the preferred embodimentsof ourinvention, it is illustrated upon Figure l as having been adapted to astore or market building indicated in its entirety at H, having anopening or doorway |2 in the front wall I3 thereof. It will be observedthat the doorway I2 is of relatively large proportions, inasmuch as itoccupies substantially the entire area of the front wall 3 of thebuilding Our invention makes it possible to employ a door I for thislarge doorway i2, which is a rigid member adapted to be moved bodily andwithout altering the shape of the door itself, when opening or closingthe door.

Although we do not wish to be so limited, we

prefer to employ a plurality of units or panels l6, which may beassembled into planer alinement and rigidly fastened in such arrangementso as to provide the door ll of thenecessary width. The construction ofthe door is best illustrated aoiasva upon Figure 'l, which shows all thepanels it rigidly secured as by rivets ii. to a longitudinally extendingtruss I8. This truss it comprises ion gitudinal members I9 and 2|, whichpreferably are angle irons and which constitute the members to which thepanels l6 are secured by the rivets H. The longitudinal members l9 and2| are interconnected by transverse members 22 which extend verticallywhen the door is in vertical position, and transverse members 23, whichextend diagonally between the longitudinal members l9 and 2|. Thearrangement of members l9, 2|, 22 and 23, which is illustrated uponFigure 7 is merely exemplary, it being understood that the particulardesign of truss |8 to be employed depends upon the dimensions of thedoor M in any particular installation. In any event, however, thelongitudinal member I9 which is uppermost when the door is disposed in avertical plane constitutes the compression member of the truss |8,whereas the lowermost longitudinal member 2| will be in tension. Thus itmay be seen that the truss l8, whatever its specific design, supportsthose portions of the door I 4 which are disposed between the points ofsupport of the door, from sagging, even though those points of supportare relatively remote from each other.

As will be explained herein below, the door l4 lies in a horizontalplane when open, and accordingly we have provided means for supportingthose portions of the door which are intermediate the points of supportthereof when the door is in open or horizontal position also. This isaccomplished by designing the truss |8 as a two-way truss, for whichpurpose rods 26 are associated with the longitudinal members l9 and 2|.Each of these rods 26 extends between the transverse vertical members 22which are adjacent the supporting brackets 21, it being understood,therefore, that the transverse members 22 to which the ends of the rods26 are secured are disclosed at or closely adjacent to the points ofsupport of the door I4. Where the ends of the rods 26 are anchored tothese transverse .members 22 they are disposed closely adjacent theplane of the inner face of the panels I6; but from these points ofanchorage of the rods 26 they incline outwards from that plane, asclearly shown upon Figure 8 to the central portions 28 thereof, whichare retained spaced from the panels l6 by saddles 29. Thus it may beseen that each of the rods 26 co-- operates with the particular portionof the longitudinal member l9 or 2|, as the case might be, with which itis associated, the rod 26 operating as the tension member of the trussand the associated portion of the longitudinal member L9 or 2|, 'as thecase might be, operating as the compression member. In other words, therods 26 .serve as the tension members of the truss and the longitudinalmembers I9 and 2| serve as the compression members of the truss when thedoor I4 is in horizontal or open position, whereas the longitudinalmember I!) serves as the compression member and the longitudinal member2| serves as the tension member when the door I4 is in vertical orclosed position.

Means are provided for mounting the door for pivotal movement about anaxis which extends longitudinally of the door. The position for thisaxis is so chosen that whereas the door occupies a vertical planebetween the jambs 3| at opposite ends of the doorway 2, when closed, thedoor opens by swinging upwards to its open position wherein it lies in ahorizontal plane closely ad iacent the upper peripheral edge, 1. e. thelintel this by disposing the axis about which the door swings, inparallelism with the plane of the door and lying] within a plane whichinclines at substantially forty-five degrees with respect to the .planeof the door and from the neutral axis of the door, 1. e. from thehorizontal line within the door which includes the center of gravity ofthe door. is indicated at 33, and from this line 33 a plurality of arms34 rigid with the inner face of the door, incline, the direction ofinclination being toward that edge 36 of the door which is uppermostwhen the door is closed, and the angle of their inclination with respectto the door being substantially 45. These alined arms 34 are providedwith means for bracing them to hold their outer ends perfectly rigidwith respect to the door I4, the preferred bracing means being ahorizontal arm 31 extending from the outer end of each inclined arm 34and perpendicularly to the inner face of thedoor, where it is rigidlysecured preferably by being riveted or otherwise permanently attached toone of the transverse members 22', it being preferred also that theassociated brackets will beprovided adjacent each end of inclined arm 34is also rigidly attached to the same transverse member 22. Thus it maybe'seen that each inclined arm 34 co-operates with the associated arm 31and the associated transverse member 22 of the truss l3 todefine abracket on the inner faceof the door l4. One of these the door; and asmany additional brackets interbuilding I i.

mediate theends thereof will be provided as are found to be necessary asdetermined by the particular details ofinstallation, these detailsincluding such factors as the weight of the door, its overall length,and the like. i Brackets 33 thus defined are provided with alinedhubs33, which may be merely blocks 4| of metal secured to the brackets33 and having holes 42 therethrough for the reception of a shaft orother suitable pivot means. As-pointed out hereinabove, the common axisof all these holes 42 lies in the plane which inclines at 45 withrespect to the plane at the door and which includes the neutral axis 33of the door.

Supporting means are provided to which the alined hubs 33 are pivotallyconnected, these supporting means being in the form of stationarybrackets 46 rigid with any suitable portion of the For example, thestationary brackets 46 associated with the door bracket 33 which areproximal the ends of'the door may be mounted rigidly upon the jams I3,although they, would operate equally efiicientlyif they were secured toany other supporting structure within or forming a portion of thebuilding ii. For each of the intermediate door brackets 33 a stationarybracket 41 is mounted upon any suitable supporting structure, butinasmuch as it is desired usually 3 to leave the doorway I2 unobstructedwhen the door is open, we prefer thatnthese intermediate stationarybrackets 41 extend downwards from above. To fulfill these requirementsit or they,

. as the case might he, should be rigidly secured This horizontal line,i. e. the neutral axis,

each of the intermediate stationarybrackets 41,, this slot 43 extendingdownwards'within the door from the upper edge '33 thereof, so -astopermit the upper edge 33 of the door topasstthe vertical member 3| ofthe associated intermediate stationary bracket 41, as clearly shown uponFigure '7. For the sake of convenience throughout the remainder of thespecification, both the end brackets 43 and the intermediate brackets 41will'be indicated by the reference numeral 21, these sta- 1o tionarybrackets being the supporting members for the door [4. c I

Whereas the axis about which the door turns when opening or closing lieswithin a plane which inclines at 45 with respect to the plane of thedoor and from the center of gravity of the door, the distance of thepivotal axis from the door measured in a line perpendicular to the doormay bevaried without departing from the spirit of the present invention.We prefenhoweventhat the distance of this axis from the door be suchthat it lies within a plane perpendicular to the plane of the door andapproximately one-half the distance from the neutral axis 33pto theupper edge 33. This will causethe door l4 to assume 23 a position as itswin'gsupwards into ,a horizontal plane, wherein it extends through thedoorway l2 and closely adjacent the lintel 32. Moreover. approximatelythe lower one-third of the door will extend outside the door, whereasthe upper twothirds will be disposed within the building II,

as clearly shown upon Figure 9. Hence, when in open position,thelowerthird of the door which extends outwards beyond the plane of thefrom. wall l3 of the building ll serves as an awning, inasmuch as itwill protect from the direct rays of the sun articles which aredisplayed within the building and closely adiacentthe doorway l2.Furthermore; this particular arrangement of parts, wherein the axisabout which the door rotates isdisposed substantially as hereinabovedescribedywill cause the door to lie ina horizontal plane when openedfully, which is closely adjacent to the lintel 32, thereby disposing thedoor in an overhead position, leaving substantially the entireopening ofthe doorway l2 unobstructed.

Means are provided for counterbalancing the door so that it will remainin any position to which it may be moved without having anymeansincorporated therewith.

Figure 2 shows it onemodiflcation of counterfastening 50 balancingdevice wherein a weight 331s pivotally secured to and suspends from anarm 31 which is an extension of the inclined arm34 of one of 5 the doorbrackets 31. The axis 33 of the pivot 33 whereby the weight 33 isconnected to thearm 31 lies in the same inclined plane which includesthe axes of the hubs 4| and the center of gravity of the door.Accordingly, the center of gravity 6 of the door and the axis. of thepivotal connection 33 of the weight 33 to the arm 31 are disposed upondiametrically opposite sides of the axis about which the door turns, andinasmuch as the counterweight 33 is of sufflcient mass .effectually tocounterbalancethe door l4, it will be seen that the turning moment ofthe counterweight 33 if only one be employed, or of the the door appliesits force, but in the opposite 73 front wall. I3.

ly connected as by a crank pin 82.

direction of rotation, increase. Accordingly, even without beingfastened, the door ll will remain in any position to which it is moved,regardless of whether that position be either fully opened or fullyclosed, or in any position between these two extremes of movement.

Figures 4, 5 and 6 show a modified form of counterbalancing mechanismwherein the counterbalancing effect is identical with that of themechanism just described, butwherein an added convenience is afforded,'Here, instead of being pivoted directly to an extension of the inclinedarm of the door bracket, thccounterweight 6| is pivotally suspended froma lever 82, adjacent the forward end thereof, and the after end of thelever 62 is pivoted to an idler link 63, which in turn is pivoted to astationary member such as an extension-64 of the associated stationarybracket 66. An arm 61, which is an extension of the inclined member 68of the associated door bracket 69 is pivoted as by a pin 1| to the lever62 intermediate the ends thereof, so that the weight imposed by thecounterweight 6| upon the lever 62 is thus applied in a downwarddirection to the after end of the arm 61, which is upon the oppositeside of the axis about which the door turns,.from the center of gravityof the door. The link provides a moving fulcrum for the lever 62,permitting the entire lever 62 to move away from the front wall l3 ofthe building, while the door swings from'fully open position or fromfully closed position to a position intermediate these two extremes ofmovement. This shifting of the lever 62 compensates for the arcuatemovement of the weight 6|, the result being that the weight 6|. moves ina more nearly vertical line and thereby requiring the provision ofmaterially less space for its accommodation. Moreover, this arrangementof parts disposes thecounterweight 6| for movement in a line whichlies-between the axis about which the door turns and the front wall l3,whereas inthe'first described modification the weight 56 is at all timesupon the opposite side of the axis of rotation from the front wall l3.

As may readily be understood, one or more of the counterbalancingmechanisms and of either modification thereof may be employed, thenumber and type of counterbalancing devices depending upon thecircumstances of any particular installation. It is believed, however,that most installations will operate most efliciently-if one of thecounterbalancing devices be associated with each end of the door.

Means are provided for operating the door, i. e., for moving it fromopen to closed position, orfrom closed to open position. This operatingmeans is of such a nature that the door may efliciently be operated froma location remote from the doorway, if desired. Preferably, however, theparts are so arranged that the door may be opened and closed fromoutside the building For this purpose a rod 16 is journalled in andextends through one of the jambs |3 in perpendicularity with the planeof the The'outer end of the rod 16 carries'amanually operable crank 11whereby the rod may be turned by persons standing outside the buildingH. To the inner end of therod 16, which preferably issupported by meansof a bracket 18 rigid with the associated stationary bracket 27, a crank19 is rigidly secured and to the outer end of this crank 19 a link 8| ispivotal- The other end of the link 8| is pivotally connected to theproximal door bracket 38 at a point between the axis about which thedoor turns and the door itself. Accordingly, when the rod 16 is turnedfrom the position indicated upon the Figure 2 the crank 19 will be swungupwards, pushing the 5 link 8| upwards and thereby causing the door Ialso to be swung upwards about the axis of the hubs 39. The parts are soproportioned and arranged that movement of the door M from fully openedto fully closed position requires ro- 1o tation of the crank .19 and rod16 through substantially 180". However, after arrival of the door M ateither fully opened or fully closed position, the rod 16 and crank 19can be rotated through a few more degrees, thereby causing the i5 crank19 to pass the dead center position before engaging the stop means whichare provided to prevent further movement thereof. This prevents movementof the door M from either its fully opened or fully closed positionwithout first turning the rod 16, preferably by means of the handle 11,and thus prevents inadvertant dropping of the door fromits overheadposition, to the possible injury of persons standing therebeneath.Moreover, by providing the rod 16 or the handle 11 with any suitabletype of lock 80, adequate means are provided for preventing opening ofthe door H by any one other than properly authorized persons. Whereasany suitable stop means may be provided, we have found it convenient toso arrange the parts that the crank 19 or the link 8| comes intoengagement with one of the members of the associated stationary bracket2'! after having moved a few degrees past its top dead center position,and with a lug 84 carried by the link 8! after having moved a fewdegrees past the bottom dead center position. Or, if desired, the lug 84may be carried by the crank itself and come into engagement with thelink 8| after the crank has passed its bottom dead center position.

Whereas it has been stated hereinabove that the counterweight 56 or 6|as the case might be is connected to the associated door bracket 38through the expedient of an arm 5! or 61 respectively, which arm is anextension of the inclined member. of the associated door bracket, it isnot necessary that this extension be perfectly straight, the onlyrequirement being that the axis of the pivotal connection of the weightto that arm lie in the plane which also includes the axis about whichthe door turns and the center of gravity of the door. Preferably the arm51 is disposed upon the opposite side of the journal 86, which iscarried by the associated 55 stationary bracket, from the door bracket38 to which'it is connected by means of a pin 81, extending rotatablythrough the journal 86, both the arm 51 and the bracket 38 being rigidlyconnected to the pin 81. Accordingly, the turning moments ofthecounterweight and of the door respectively will be applied to thejournal 85 from opposite sides thereof, thus preventing the developmentof any torque tending to twist the associated stationary bracket 21,such as that which would be developed if both the arm 51 and the bracket38 were disposed at one end of the journal. The same effect is gained byconnecting the link 8| to the arm 51, but upon the opposite side of thepivot pin 81 from the counterweight 56, so that rotational eifortapplied to the door from thecrank 19 also will be upon the opposite endof the journal 88 from the bracket 38. Preferably the arm 51 and thebracket 38, in addition to being rigidly secured to the pin 81 arerigidly interconnected by means of a strip 88, one end of which is rigidwith the arm 51 and the other end of which is rigid with the bracket 88with the intermediate portion 89 of the strip 88, extending through theassociated stationary bracket 21, as clearly shown upon Figure 3. Thisbracket consists of upper and lower arms 8| and 82 respectively, each ofwhich is provided with a block 93 of suitable cushioning material suchas rubber, in position to be engaged by the intermediate portion 89 ofthe strip 88, just prior to the time at which the door arrives at fullyopened 'or fully closed position. Hence, these cushioning blocks 93provide the stop means for the door, holding the door against movingbeyond its extreme positions and without permitting the door to comeinto engagement with any structure on the lintel 82, jambs l8, or thesill 88.

Inasmuch as the force applied to the door in moving it toward or awayfrom open position is applied adjacent only one end of the door, it maybe desirable under certain circumstances of installation to substitute acontinuous shaft 98 (see Figure 6) for the several pins 81 whereby thedoor brackets 38 are pivotally connected to the associated stationarybrackets 21. This shaft 98 is keyed or otherwise rigidly connected toall of the door brackets 21 and to all of the arms 51 or 81, as the casemight be, to which the counter weights 58 or 8] respectively areconnected, and is journalled in all of the stationary brackets 21, theresult being that when rotational effort is applied at but one point ofthe shaft 88, this rotational effort is applied to the door at severalpoints by the several door brackets 38. Accordingly this detail ofconstruction co-operates with the truss l8 in distributing stressesimposed upon the door throughout the entire door. Toward this same endthe truss i8 is provided with means for preventing racking of. the doorfrom a perfectly flat plane. This is conveniently accomplished by meansof gusset plates |8| provided wherever transverse members 22 and/or 23of the truss I8 are connected to the longitudinal members is or 2|.These gusset plates assist the transverse members 22 and 28 in acting ascantilever beams when a force is applied to the door which would tend tomake one end of one of these transverse members 22 or 28 as the casemight be, to move away from the plane of the door without there beingapplied a force of equal magnitude and in the same direction at theother end of that same transverse member. Accordingly, this detail ofconstruction of the door and the means effort to several points withinthe door when the door is being opened or closed, co-operate with theprovision of the intermediate stationary brackets 41 by permitting theuse of a door which otherwise would be excessively long, due to its notbeing reinforced against sagging, bending and torsional stresses.

Whereas any suitable type of weight may be employed for thecounterweight 56 or (H, as the case might be, it should be pointed outthat the preferred form consists of a hollow container, as bestillustrated upon Figures i and 6, which may be shipped empty, and intowhich any suitable material, such as sand, water, bricks, or the likemay be placed after installation. This perpcsed angularly with respectto for distributing rotational mits of accurate adiustment of thecounterweights, so that they are capable of exerting just the desiredamount of turning movement against the pins 82 or the shaft 88, as thecase might be, to counterbalance the door I.

It should further be pointed out that whereas the fully opened positionof the door ll has 7 been described throughout the specification andclaims as being in a substantially horizontal plane, this and similarterms are intended to be construed broadly enough to include closureconstruction wherein the door in its open position is at sufficientinclination from the horizontal to insure adequate drainage therefrom.

We claim:

l. A frame for a movable panel comprising a plurality of members amxedto said panel, said members comprising spaced longitudinal members andtransverse members interconnecting said longitudinal members at spacedintervals to define a truss, one of said longitudinal members being incompression and another in tension when said panel is in one positionand both of said longitudinal members being in compression when saidpanel is in another position, and additlonal longitudinal memberscooperating with said first mentioned longitudinal members to define asecond truss the plane of which is disposed angularly with respect tothe plane of said first mentioned truss, said additional longitudinalmembers being in tension when said panel is in said other position.

2. In a panel frame of the character described, a truss comprisingspaced chords and web members interconnecting said chords, and meansreinforcing said chords against flexure out of the plane of said truss,said reinforcing means comprising another truss the plane of which isdisthat of said first mentioned truss.

3. In a panel frame of the character described, a truss comprisingspaced chords and web members interconnecting said chords, and meansreinforcing said chords against flexure out of the plane of said truss,said reinforcing means com-' prising means cooperating with each of saidchords to define another truss the plane of which is disposed angularlywith respect to that of said first mentioned truss.

4. In a panel frame of the character described, a truss comprisingspaced chords and web members interconnecting said chords, and means.reinforcing said chords against flexure out or the plane of said truss,said reinforcing means comprising another chord rigid with and spacedfrom each of said first mentioned chords and lying outside the plane ofsaid truss.

5. In a movable panel frame of the character described, a trusscomprising spaced chords and web members interconnecting said chords,said chords being subjected to stresses of opposite type in one positionof said panel, and an additional chord associated with each of saidfirst mentioned chords, all of said first mentioned chords beingsubjected to the same type of stress and all of said additional chordsbeing subjected to the opposite type of stress in another position ofsaid panel.

. WESLEY W. EAGER.

COLUMBUS A. TIERN'EY.

